Most important refer Ncert books

Have good conceptual knowledge of every topic

You should focus on important topics first

Quickly revise all topics which are mostly asked

Try to remember all the concepts you learn during day before sleeping at night

All the best !!!

In last 3 months you should focus on important chapters of BITSAT. Make sure you clear your basics. Mostly questions in BITSAT are direct. So, you should refer NCERT books for that.

Below are the important topics for BITSAT

Physics – Mechanics (Newton’s Laws, Work and Energy, Rotational Dynamics etc), Thermodynamics , Electrostatics and Electromagnetism.

Mathematics –  Integral Calculus, Differential Calculus, Coordinate Geometry and Complex Numbers. 

Chemistry- Inorganic Chemistry, Ionic Equilibrium, Chemical Equilibrium.

Solve as many as mock test series for your practice as BITSAT is all about speed. You can also refer previous year papers to know about the exam pattern and level of the questions. 

All the best!!